<?php

/**
 * UserIdentity represents the data needed to identity a user.
 * It contains the authentication method that checks if the provided
 * data can identity the user.
 */
class UserIdentity extends CUserIdentity
{
	/**
	 * Authenticates a user.
	 * The example implementation makes sure if the username and password
	 * are both 'demo'.
	 * In practical applications, this should be changed to authenticate
	 * against some persistent user identity storage (e.g. database).
	 * @return boolean whether authentication succeeds.
	 */
	public function authenticate()
	{
	    $mu = new User;
	    $criteria = new CDbCriteria();  
		$criteria->select    = 'username,passwd'; 
		$criteria->condition = 'username=:username';  
		$criteria->params    = array(':username' => $this->username);
		$criteria->limit     = 1;
		$db_users = User::model()->findAll($criteria);
		
		$users=array(
				'demo'=>'demo',
				'admin'=>'admin',
		);	
		
        if (count($db_users)) 
		{
			$users[$db_users[0]->username] = $db_users[0]->passwd;	
		}
		if(!isset($users[$this->username]))
			$this->errorCode=self::ERROR_USERNAME_INVALID;
		elseif($users[$this->username]!==$this->password)
			$this->errorCode=self::ERROR_PASSWORD_INVALID;
		else
			$this->errorCode=self::ERROR_NONE;
		return !$this->errorCode;
	}
}